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Impact of a Carbohydrate Mouth Rinse on Corticomotor Excitability after Mental Fatigue in Healthy College-Aged Subjects

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Department of Physical Therapy Education, Elon University, Elon, NC 27244, USA
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Department of Food, Bioprocessing, and Nutrition Sciences, NC State University, Raleigh, NC 27695, USA
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Department of Mathematics & Statistics, Elon University, Elon, NC 27244, USA
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Human Physiology and Sports Physiotherapy Research Group, Vrije Universiteit Brussel, 1050 Brussels, Belgium
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Sport and Exercise Science, School of Psychology and Life Sciences, Canterbury Christ Church University, Canterbury Campus, Canterbury, Kent CT1 1QU, UK
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VIPER Research Unit, Royal Military Academy, 1000 Brussels, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Elise Klein
Brain Sci. 2021, 11(8), 972; https://doi.org/10.3390/brainsci11080972
Received: 11 June 2021 / Revised: 15 July 2021 / Accepted: 20 July 2021 / Published: 23 July 2021
Mental Fatigue (MF) has been associated with reduced physical performance but the mechanisms underlying this result are unclear. A reduction in excitability of the corticomotor system is a way mental fatigue could negatively impact physical performance. Carbohydrate (CHO) mouth rinse (MR) has been shown to increase corticomotor excitability. PURPOSE: The purpose of this study was to determine if CHO MR impacts corticomotor excitability after MF. METHODS: Fifteen subjects (nine females, six males; age = 23 ± 1 years; height = 171 ± 2 cm; body mass = 69 ± 3 kg; BMI = 23.8 ± 0.7) completed two sessions under different MR conditions (Placebo (PLAC), 6.4% glucose (CHO)) separated by at least 48 h and applied in a double-blinded randomized fashion. Motor-evoked potential (MEP) of the left first dorsal interosseous (FDI) was determined by transcranial magnetic stimulation (TMS) before and after MF. Perceived MF was recorded before and after the MF task using a 100 mm visual analog scale (VAS). RESULTS: MF was greater following PLAC (+30.4 ± 4.0 mm) than CHO (+19.4 ± 3.9 mm) (p = 0.005). MEP was reduced more following PLAC (−16.6 ± 4.4%) than CHO (−3.7 ± 4.7%) (p < 0.001). CONCLUSIONS: CHO MR was successful at attenuating the reduction in corticomotor excitability after MF. Carbohydrate mouth rinse may be a valuable tool at combating the negative consequences of mental fatigue. View Full-Text
Keywords: TMS; mental fatigue; carbohydrate TMS; mental fatigue; carbohydrate
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MDPI and ACS Style

Bailey, S.P.; Harris, G.K.; Lewis, K.; Llewellyn, T.A.; Watkins, R.; Weaver, M.A.; Roelands, B.; Van Cutsem, J.; Folger, S.F. Impact of a Carbohydrate Mouth Rinse on Corticomotor Excitability after Mental Fatigue in Healthy College-Aged Subjects. Brain Sci. 2021, 11, 972. https://doi.org/10.3390/brainsci11080972

AMA Style

Bailey SP, Harris GK, Lewis K, Llewellyn TA, Watkins R, Weaver MA, Roelands B, Van Cutsem J, Folger SF. Impact of a Carbohydrate Mouth Rinse on Corticomotor Excitability after Mental Fatigue in Healthy College-Aged Subjects. Brain Sciences. 2021; 11(8):972. https://doi.org/10.3390/brainsci11080972

Chicago/Turabian Style

Bailey, Stephen P., G. K. Harris, Kaitlin Lewis, Tracy A. Llewellyn, Ruth Watkins, Mark A. Weaver, Bart Roelands, Jeroen Van Cutsem, and Stephen F. Folger. 2021. "Impact of a Carbohydrate Mouth Rinse on Corticomotor Excitability after Mental Fatigue in Healthy College-Aged Subjects" Brain Sciences 11, no. 8: 972. https://doi.org/10.3390/brainsci11080972

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